Malicious PDF — malware analysis report

Static analysis result for SHA-256 684378f4f7067870…

MALICIOUS

PDF

66.8 KB Created: 2021-06-10 19:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9011a9b33f2e1e97142d292497f395ac SHA-1: a4e7206cd5a6de5c6debfb5cc8c1f86a579bc325 SHA-256: 684378f4f7067870bbc44bacc03a43c509599cfb1e49b2bb97f049402a6b774b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=linear+equations+word+problems+class+7
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d3166906498a7ed7eaff81cd52359b02/xojimo.pdf
    • https://bursac.net/userfiles/file/pazomufowoj.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1d34n18iekhgb3oud7odag43pg/viwexanulomarezafodetef.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8efea23ec---senaw.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3854c19de---terorabewa.pdf
    • http://asustainable.com/global/file/58553622354.pdf
    • http://amirafouad.com/uploaded_files/file/vaxufanomosexo.pdf
    • http://allycatering.com/userfiles/63990129527.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lunapil.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838cb852890---zitenumenozuseserod.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5b5f19b6---jebugunimuxubofomopori.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2137a579---dezazizamigon.pdf
    • http://dynamic1984.com/user_file/file/34789654133.pdf
    • http://abacusnancy.com/userfiles/file/18941019424.pdf
    • https://asthasupermarket.com/userfiles/file/binolujuwalokiwemukur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee38.bin
91af1e38ada717b234a313ecbc5cddfdf8cab7c503e775382ebc281e6b236a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 5600 bytes

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